Ichan

The bone-rank system (Korean: 골품제도) was the system of aristocratic rank used in the ancient Korean kingdom of Silla. It was used to segregate society, and particularly the layers of the aristocracy, on the basis of their hereditary proximity to the throne and the level of authority they were permitted to wield. The idea of royal blood in other societies is a close analogue to the idea of "sacred bone" in Sillan society.